JPS5842841B2 - Pest control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for exterminating pests by fumigating insecticides, and more specifically, a method for fumigating insecticides intensively in a short period of time to eliminate sanitary pests such as mosquitoes and flies in rooms and other confined spaces. , Concerning how to get rid of cockroaches, etc.

Conventionally, a common method for exterminating pests by fumigating insecticides in a short period of time is to use so-called fumigants, which mix the chemicals with a combustion agent and release the chemicals through the combustion heat and smoke of the combustion agent. However, it has the following drawbacks.

In other words, in order to quickly evaporate a large amount of insecticide, it is essential to burn a combustion agent that generates highly toxic smoke. Therefore, when using this smoke agent, there is no irritating odor caused by the smoke from the combustion agent, and the human body etc. There is a risk of fire and other hazards.

More importantly, with the above-mentioned smoke agent, thermal decomposition of the insecticide due to combustion heat, resulting in a decrease in effective volatilization rate, that is, a decrease in insecticidal efficiency, and economic loss cannot be avoided.

The present invention is capable of instantly and effectively evaporating a large amount of insecticide over a wide range, instead of the above-mentioned known pest control method using a smoke agent, and is capable of evaporating a large amount of insecticide instantly and effectively without producing smoke, thus reducing the toxicity caused by the insecticide. To provide a new pest extermination method that does not cause problems such as irritating odors and does not pose a risk of fire.

That is, in the present invention, when an insecticide is fumigated to exterminate pests, the insecticide is thermally decomposed at a temperature of 300° C. or lower and mixed with an organic foaming agent that mainly generates nitrogen gas, and the mixture is indirectly heated. The present invention relates to a pest control method characterized by thermally decomposing an organic foaming agent without combustion and effectively fumigating an insecticide by the action of the thermally decomposed gas.

As the insecticidal agent in the present invention, any of the various agents conventionally used in pest control agents can be used.

The following are examples of representative drugs.

O3-allyl-2-methylcyclopent-2-ene-4
-one-1-yl dl-cis/transchrysanthemate (generic name allethrin; trade name pinamine; manufactured by Sumitomo Chemical Co., Ltd., hereinafter referred to as pinamine) ○3-aryl-2-methylcyclopent-2-ene-4
-one-1-yl d-cis/trans chrysanthemate (trade name: Pinamin Forte: manufactured by Sumitomo Chemical Co., Ltd., hereinafter referred to as Pinamin Forte) ○d-3-aryl-2-methylcyclopent-2ene-
4-on-1-yl d-transchrysanthemate (
Trade name: Exrin: Manufactured by Sumitomo Chemical Co., Ltd. (hereinafter referred to as Exrin) O3-allyl-2-methylcyclopent-2-en-4-on-1-yl cl-) Lansu chrysanthemate (generic name Paioallethrin, (hereinafter referred to as bioallethrin) ON-(3,4,5,6-titrahydrophthalimito)-
Methyl di-cis/trans-chrysanthemate (generic name: phthalthrin; trade name: neopinamine; manufactured by Sumitomo Chemical Co., Ltd., hereinafter referred to as "neopinamine") 05-benzyl-3-furylmethyl d-cis/trans-chrysanthemate (generic name: neopinamine) Cysmetrin: Trade name Lithrone Forte: Manufactured by Sumitomo Chemical Co., Ltd., hereinafter referred to as Crythrone Forte) ○5-(2-7' Lobaquil)-
3-furylmethylchrysanthemate (generic name: furamethrin, hereinafter referred to as furamethrin) ○3-phenoxybenzyl 2,2-dimethyl 3-(2
',2'-dichloro)vinylcyclopropane carboxylate (generic name: vermethrin; product name: Exmin; manufactured by Sumitomo Chemical Co., Ltd., hereinafter referred to as Exmin) O3-phenoxybenzyl d-cis/trans-chrysanthemate (generic name: fetuthrin: product) Name Smithlin:
(manufactured by Sumitomo Chemical Co., Ltd., hereinafter referred to as Smithlin) ○α-Cyanophenoxybenzyl isopropyl 4-chlorophenylacetate (generic name: Fuenvalerate; trade name: Sumicidin, manufactured by Sumitomo Chemical Co., Ltd., hereinafter referred to as Smithidin) Od-3-allyl- 2-Methylcyclopent-2-en-4-one-1-yl d-) Lance chrysanthemate (trade name: Exlin, manufactured by Sumitomo Chemical Co., Ltd., hereinafter referred to as Exlin) ○(S)-α-cyano-3 -Phenoxybenzyl (IR・cis)-3-(2
・2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate (hereinafter referred to as decamethrin) 0(R-8)-α-cyano-3-phenoxybenzyl
(IR・l5)-cis/trans-3-(2,2-dichlorovinyl)-2,2-cymer f-cyclopropanecarboxylate (hereinafter referred to as cypermethrin) ○α-cyano 3-phenoxybenzyl d-cis/ Trans-chrysanthemate (hereinafter referred to as cyphenothrin) ○1-ethynyl-2-methyl-2-pentenylcis/trans-chrysanthemate○1-ethynyl-2-methyl-2-pentenyl 2,2-
Dimethyl-3-(2-methyl-1-propenyl)cyclopropane-1-carboxylate ○1-ethynyl-2-methyl-2-pentenyl 2.2.
3,3-tetramethylcyclopropanecarboxylate○1-ethynyl-2-methyl-2-pentenyl2,2-
Dimethyl-3-(2,2-dichlorovinyl)cyclopropane-1-carboxylate 00-0-dimethyl 0-
(2,2-dichloro)vinyl phosphate (hereinafter referred to as DDV)
(referred to as P) ○o-isopropoxyphenyl methyl carbamate (hereinafter referred to as bibon) ○0-O-dimethyl ○-(3-methyl-4-nitrophenyl)thionophosphate (hereinafter referred to as sumithion) ○0-O-diethyl 0 -2-isopropyl-4methyl-pyrimidyl-(6)-thiophosphate (hereinafter referred to as diazinon) 00-0-dimethyl 5-(1,2-dicarboethoxyethyl)-dithiophosphate (hereinafter referred to as marathon) In the present invention Various commonly used additives such as efficacy enhancers, volatilization rate improvers, deodorants, fragrances, etc. can be optionally added to the above insecticidal agents.

Potency enhancers include piperonyl ptoxide, N-probylisome, MGK-264, and cinepirin 222.
, Cinepirin 500, Riesen 384, IBTA, S
-421, etc., volatilization rate improvers include phenethyl isothiocyanate, dimethyl pymixate, etc., deodorants include lauryl methacrylate (LMA), etc., and fragrances include citral, citronellal, etc.

In addition, in the present invention, as the organic blowing agent used in combination with the above-mentioned insecticide and various additives added as necessary, any of various ordinary organic blowing agents that generate mainly nitrogen gas by thermal decomposition can be used. Preferably, those having a foaming temperature of 300°C or less are preferred.

Representative organic blowing agents are illustrated in Table 1 below.

The above-mentioned organic blowing agent is a blowing agent that is usually added to
phosJ (manufactured by National Lead), rTri
baseJ (manufactured by National Lead), “OF
-14j (manufactured by Adeka Argus), “OF-15
J (manufactured by Adeka Argus), IKV-68A-IJ
(manufactured by Kyodo Yakuhin Co., Ltd.), rMark -553J (manufactured by Adeka Chemi Co., Ltd.), “S 1costab 60 J
and “5icostab 61 J (seeder (G,
Siegle & Co.) etc., Cd-
Stearate, Ca-stearate, Zn-stearate, Zn-oftate, ZnO, Sn-malate, Zn
It is possible to lower the foaming temperature by using additives such as CO3, urea, chrome yellow, and carbon black.

In the present invention, the mixing ratio of the foaming agent to the insecticidal agent can be appropriately selected depending on the desired insecticidal efficacy of the resulting insecticide, but it is usually preferable that the amount of the foaming agent be at least about % times the weight of the insecticidal agent. .

As the mixing ratio of the blowing agent increases, the effective volatilization rate of the insecticide gradually improves, but if the amount increases too much, the effect does not improve.

Usually, the amount of the foaming agent is about 30% to 30 times, preferably about 1 to 20 times the weight of the insecticidal agent.

The form of the mixture of the above insecticide and foaming agent is not particularly limited, but in consideration of workability and ease of production and use of the resulting insecticide, suitable forms such as granules, lumps, pellets, etc.
It is preferable to make it into a paste form or to mix and encapsulate it in a hot-melt resin bag or the like, and various binders, solvents, etc. can be used depending on the form of use.

In the present invention, a mixture of various forms made by mixing the insecticide and the foaming agent, and appropriate additives as necessary, is indirectly heated to heat the foaming agent in the mixture without burning the mixture. Let it break down.

In the above, various heat sources can be used that can indirectly heat the mixture to provide a temperature at which the blowing agent in the mixture can be foamed without burning the mixture.

Specifically, the following heat sources can be advantageously used.

(1) Compounds that generate heat due to hydration reaction Examples include substances that generate heat when water is added, such as magnesium chloride, aluminum chloride, calcium chloride, and iron chloride.

(2) Electric heat sources that generate heat when energized include heating wires such as nichrome wires, sheet heaters, heaters using semiconductors, and the like.

(3) A combination of a metal or metal compound that generates heat through an oxidation reaction and an auxiliary agent, etc., such as a method of mixing iron powder and an oxidizing agent (ammonium chlorate, etc.), a metal and a metal oxide that has a smaller ionization tendency than the metal. or a method in which iron is mixed with an oxidizing agent, a method in which a mixture of iron and at least one of potassium sulfate, iron sulfide, metal chloride, iron sulfate, etc. is brought into contact with water and oxygen, and a method in which a mixture of iron and at least one of potassium sulfate, iron sulfide, metal chloride, iron sulfate, etc. is brought into contact with water and oxygen; Examples include a method in which a mixture of a metal with a low ionization tendency and a halide is brought into contact with water, a method in which a mixture of a metal and a bisulfate is brought into contact with water, and a method in which water is added to a mixture of aluminum and an alkali metal nitrate. .

(4) A method that utilizes the oxidation reaction of metal sulfide, such as a method in which a mixture of sodium sulfide and iron carbide is brought into contact with oxygen, can be exemplified.

In the present invention, the various heat sources described above generate heat by energizing, mixing, or contacting with water and/or air, and the mixture of the insecticidal agent and foaming agent is indirectly heated using the amount of heat.

Indirect heating is carried out, for example, by placing a mixture containing the insecticide and foaming agent in a suitable container and placing a heat source outside the container.

More preferably, in order to effectively utilize the heat amount of the heat source, the heat source is housed in a sealed outer container, and the inner container containing the mixture containing the insecticide and the foaming agent is placed in the outer container on its bottom wall and side wall※※ It is preferable to store at least a part of the partition wall as a partition wall.

When the mixture is indirectly heated by the heat generated by the heat source, the mixture is heated without causing any ignition and combustion, and the blowing agent in the mixture undergoes a thermal decomposition reaction.

In the method of the present invention, the insecticide in the mixture is forcibly released by the gas produced by the thermal decomposition of the blowing agent, and
Its volatilization is promoted, and it is rapidly and effectively evaporated in an extremely short period of time without being exposed to high temperatures that would cause thermal decomposition or denaturation.

Therefore, according to the method of the present invention, mosquitoes, flies, fleas, bedbugs, dust mites, cockroaches, etc. living in rooms and other limited spaces can be exterminated very effectively.

Moreover, unlike conventional methods, the method of the present invention does not utilize combustion of a combustible agent, and has the advantage that it can be carried out safely and easily without substantially causing the generation of irritating odors, smoke, etc., or the risk of fire.

Examples will be given below to explain the present invention in more detail.

In addition, the effective volatilization rate of the insecticide in the examples is determined by fumigating the insecticide in a closed container, passing the air inside the container into benzene, collecting the agent in the air in benzene, concentrating it, and then performing gas chromatography. and expressed as a percentage of the initial insecticidal weight.

Example 1 Each insecticide listed in Table 2 below and a foaming agent were mixed and stored in a suitable cylindrical container, and the container was heated externally with a heating wire (maximum temperature 300°C) to blow the foaming agent inside the container. It is thermally decomposed and the insecticide is volatilized.

The results of measuring the effective volatilization rate of the insecticide at that time are shown in Table 2 below.

Comparative Example 1 An insecticide was volatilized in the same manner as in Example 1 except that the foaming agent was not used.

The results are shown in Table 3 below.

As is clear from the comparison of Tables 2 and 3 above, according to the method of the present invention, by mixing the blowing agent with the insecticide,
It turns out that when the same amount of chemical is heated to the same temperature, it can be volatilized more than ten to several dozen times more effectively.

Below, a pyrolysis gas analysis test of a specific organic blowing agent used in the present invention and an insecticidal efficacy test according to the method of the present invention were conducted.

<Analysis of pyrolysis gas> Regarding the organic blowing agent used in the present invention and cyanamide and dicyandiamide for comparison, each of these was
℃ (maximum temperature 260 to 280°C), and the gas produced by thermal decomposition was measured by a gas detection tube method.

As a result of the above test, all the organic blowing agents used in the present invention mainly produced nitrogen gas and carbon monoxide, etc., and ammonia gas was at or below the detection limit, whereas cyanamide had a boiling point of 215 When heated to a temperature slightly above ℃, it produces dicyandiamide and melamine,
Dicyandiamide primarily produces ammonia gas and melamine and melam.

Further, the melamine was thermally decomposed by heating at about 340 to 350°C to generate ammonia gas.

<Insecticidal Efficacy Test> Regarding the samples of the present invention, an insecticidal efficacy test was conducted under the following conditions, simulating an actual indoor room.

(1) Test insect Female adult German cockroach Female adult Black cockroach (2) Test materials and methods 3.6 m x 3.6 m x 2.7 m (height) = 35
A Mizuya with 4 shelves and drawers in one corner of room m.
40CrrLX 102crrLX 178crrL(
height)), and in the center of the long side wall, a horizontal slit box (
5 x 100m 1 x 2) and upper slit box (
50 ken x 50 ho).

A truncated conical container containing 10 specimens in each location in the above room (bottom inner diameter 10cIIL x height 6α x top inner diameter 12crrL1) In the case of black cockroaches, cover the top of the container with a piece of gauze to prevent them from escaping. The test sample of the present invention or the comparative sample was placed in the center of the room and fumigated in the same manner as in Example 1. After being left for 2 hours, each test insect was transferred to a rearing case, given water and food, and reared normally. Then, 48 hours after the start of the experiment, the number of dead insects is counted to determine the mortality rate (%).

The test locations are as follows.

Pl・・・10 holes with 6 threads on the top of the container in the center of the room
P2: Cover the top of the container in the center of the room with a lid with 5 holes of 6 diameters P3: Inside the horizontal slit box P4: Inside the upper slit box P5...Inside the top shelf of the Mizuya (shelf door should be left open by 10mm) P6...Inside the second drawer from the bottom of the Mizuya (bow opening) (Pull out for 10 hours) Pl...Inside the bottom shelf of the Mizuya (shelf door is left open for 20 hours) The following samples are used as test samples.

Inventive product: Sample A15 of Example 1 Comparative product: Exmin 0.51 and cyanamide 10
f? Comparison product (mixed with Exmin 0.5f and dicyandiamide 101 (3)) The results are shown in Table 4 for the test insect German cockroach. The details are shown in Table 5.

From Tables 4 and 5 above, it can be seen that according to the method of the present invention, an extremely excellent insecticidal effect can be achieved regardless of the location conditions.

Claims (1)

[Claims] 1. When fumigating an insecticide to exterminate pests, the insecticide is mixed with an organic foaming agent that generates mainly nitrogen gas by thermal decomposition at a temperature of 300°C or less, and the mixture is indirectly heated. A pest control method characterized by thermally decomposing the organic foaming agent without combustion and fumigating the insecticide by the action of the thermally decomposed gas.